Details of the Researcher

PHOTO

Naoya Takahashi
Section
Institute for Excellence in Higher Education
Job title
Assistant Professor
Degree

  • Ph.D (Tohoku University (Jointly Supervised Degree, National Taiwan University))

e-Rad No.
20945365

Research History 3

  • 2025/04 - Present
    Tohoku University　Institute for Excellence in Higher Education　Assistant professor

  • 2022/02 - Present
    Graduate School of Science, Department of Earth Science, Tohoku University

  • 2021/04 - 2022/01
    Tohoku University　International Research Institute of Disaster Science Endowed Research Division　Postdoctoral research fellow

Education 2

  • Tohoku University　Graduate School of Science　Department of Earth Science

    2016/04 - 2021/03

  • Tohoku University　Faculty of Science　Division of GeoEnvironmental Science

    2012/04 - 2016/03

Committee Memberships 4

  • 日本地理学会　集会専門委員

    2024/04 - Present

  • 東北地理学会　幹事

    2023 - Present

  • 日本活断層学会　渉外・広報委員

    2022 - Present

  • 国土地理院　全国活断層帯情報整備検討委員

    2022/04 - 2025/03

Professional Memberships 6

  • 東北地理学会

  • 日本地理学会

  • 日本地球惑星科学連合

  • American geophysical union

  • 日本地形学連合

  • 日本活断層学会

︎Show all ︎Show first 5

Research Interests 3

  • Mountain river

  • Tectonic geomorphology

  • Fluvial geomorphology

Research Areas 2

  • Natural sciences / Solid earth science / Geomorphology

  • Humanities & social sciences / Geography / Physical geography

Awards 6

  1. 若手発表賞

    2025/11　日本地形学連合2025年学術大会　改良型跳躍・磨耗侵食モデルを用いた山地河川の縦断形発達の検討

  2. 学生ポスター発表賞

    2024/08　日本第四紀学会 2024 年大会　ストリームパワーモデルに基づく活断層の活動度推定:坪沼断層の例

  3. 若手優秀講演賞

    2021/10　日本活断層学会2021年度秋季学術大会

  4. President’s Award

    2021/03　Tohoku University

  5. Best Poster Presentation Award

    2018/06　9th International INQUA Meeting on Paleoseismology, Active Tectonics and Archeoseismology

  6. 若手優秀講演賞

    2017/11　日本活断層学会2017年度秋季学術大会

Show all ︎Show 5

Papers 18

  1. Shape evolution of bulk sediment in headwater streams: effects of rock type and particle size Peer-reviewed

    Naoya O. Takahashi, Daisuke Ishimura, Keitaro Yamada, Ryoga J. Ohta, Yuki Arai, Yuki Yamane

    Earth Surface Dynamics　13　(5)　959-980　2025/09/25

    DOI： 10.5194/esurf-13-959-2025 　

  2. Relative role of rock erodibility and sediment load in setting channel slope of mountain rivers Peer-reviewed

    Naoya O. Takahashi

    Earth Surface Processes and Landforms　50　(2)　2025/02/19

    Publisher: Wiley

    DOI： 10.1002/esp.70017 　

    ISSN： 0197-9337

    eISSN： 1096-9837

    More details Close

    Abstract Rock strength influences channel slope by altering substrate erodibility and the size of sediments supplied to the channels. Although the frequent presence of knickpoints at lithological boundaries indicates that rock erodibility significantly determines channel morphology, a growing body of field evidence suggests that the coarse sediment supply from less erodible rock units is a primary factor in channel steepening. To assess the relative effects of rock erodibility and imposed sediment load on channel slope, I studied five rivers in Tsugaru, northern Japan. These rivers flow through alternating volcanic rock and sedimentary rock. The minimum channel slope required to transport both in situ sediments and those supplied from upstream was calculated using slope component analysis. The findings suggest that sediment effects largely account for the observed variations in channel slope across both volcanic and sedimentary rocks. The proportion of channel slope not explained by the imposed sediment load was slightly higher in volcanic rock reaches than in sedimentary rock reaches, which can be attributed to the lower erodibility of volcanic rock. Based on the grain size distributions of volcanic and sedimentary rock particles and the calculated impacts of sediment load, I conclude that the coarse sediment supply from volcanic rock is the primary cause of the difference in channel steepness between the rock types in Tsugaru. Although this conclusion holds generally true across Tsugaru, certain reaches with locally high channel steepness exhibit more extensive bedrock exposure than adjacent gentler reaches, suggesting that contrasts in erodibility also play a significant role in determining the channel slope. Therefore, examining what factors alter the relative significance of rock erodibility and sediment load can enhance our understanding of how rock properties influence longitudinal stream profiles.

  3. Transient Response and Adjustment Timescales of Channel Width and Angle of Valley‐Side Slopes to Accelerated Incision International-coauthorship Peer-reviewed

    Naoya O. Takahashi, J. Bruce H. Shyu, Shinji Toda, Yuki Matsushi, Ryoga J. Ohta, Hiroyuki Matsuzaki

    Journal of Geophysical Research: Earth Surface　128　(8)　2023/07/27

    Publisher: American Geophysical Union (AGU)

    DOI： 10.1029/2022jf006967 　

    ISSN： 2169-9003

    eISSN： 2169-9011

    More details Close

    Abstract Studying bedrock rivers during their transient states helps understand the response of a fluvial system to the changing boundary conditions. Although theoretical studies predict how river form adjusts to changes in incision or rock uplift rates, field constraints on the timescale of this adjustment are limited. We investigated the transient behavior of channels and hillslopes and estimated the adjustment times of channel width and angle of valley‐side slopes to accelerated incision based on knickpoint travel time. We documented channel slopes, channel widths, and hillslope angles along six rivers around an active normal fault in Iwaki, Japan, and identified river sections in a transient state. Channel slopes and basin‐averaged erosion rates determined from 10Be concentrations are distinct between rivers near and distant from the fault, suggesting that past increases in fault throw rates triggered the knickpoint formation and the observed transient response. Adjustment time for width is at least 105 years and can take 106 years after the knickpoint passage. Adjustment time for hillslope angles is generally shorter than for channel width. However, the hillslope adjustment may take longer than previously reported if the effect of width adjustment on hillslope angles is significant or the complete adjustment of hillslope angles is considered. The fact that channel slope, channel width, and hillslope angle have distinct adjustment times underlines the importance of correctly identifying river sections that are fully adjusted to the new boundary conditions when inferring erosion or relative uplift rates for bedrock rivers.

  4. Long-term uplift pattern recorded by rivers across contrasting lithology: Insights into earthquake recurrence in the epicentral area of the 2016 Kumamoto earthquake, Japan International-coauthorship Peer-reviewed

    Naoya Takahashi, J. B. H. Shyu, Chia-Yu Chen, Shinji Toda

    Geomorphology　419　108492-108492　2022/12

    Publisher: Elsevier BV

    DOI： 10.1016/j.geomorph.2022.108492 　

    ISSN： 0169-555X

  5. Evaluating variability in coseismic slips of paleoearthquakes from an incomplete slip history: an example from displaced terrace flights across the Kamishiro fault, central Japan Peer-reviewed

    Naoya Takahashi, Shinji Toda

    Progress in Earth and Planetary Science　8　(1)　2021/12

    Publisher: Springer Science and Business Media LLC

    DOI： 10.1186/s40645-021-00407-w 　

    eISSN： 2197-4284

    More details Close

    <title>Abstract</title>Examining the regularity in slip over seismic cycles leads to an understanding of earthquake recurrence and provides the basis for probabilistic seismic hazard assessment. Systematic analysis of three-dimensional paleoseismic trenches and analysis of offset markers along faults reveal slip history. Flights of displaced terraces have also been used to study slips of paleoearthquakes when the number of earthquakes contributing to the observed displacement of a terrace is known. This study presents a Monte Carlo-based approach to estimating slip variability using displaced terraces when a detailed paleoseismic record is not available. First, we mapped fluvial terraces across the Kamishiro fault, which is an intra-plate reverse fault in central Japan, and systematically measured the cumulative dip slip of the mapped terraces. By combining these measurements with the age of the paleoearthquakes, we estimated the amount of dip slip for the penultimate event (PE) and antepenultimate event (APE) to be 1.6 and 3.4 m, respectively. The APE slip was nearly three times larger than the most recent event of 2014 (Mw 6.2): 1.2 m. This suggests that the rupture length of the APE was much longer than that of the 2014 event and the entire Kamishiro fault ruptured with adjacent faults during the APE. Thereafter, we performed the Monte Carlo simulations to explore the possible range of the coefficient of variation for slip per event (COVs). The simulation considered all the possible rupture histories in terms of the number of events and their slip amounts. The resulting COVs typically ranged between 0.3 and 0.54, indicating a large variation in the slip per event of the Kamishiro fault during the last few thousand years. To test the accuracy of our approach, we performed the same simulation to a fault whose slip per event was well constrained. The result showed that the error in the COVs estimate was less than 0.15 in 86% of realizations, which was comparable to the uncertainty in COVs derived from a paleoseismic trenching. Based on the accuracy test, we conclude that the Monte Carlo-based approach should help assess the regularity of earthquakes using an incomplete paleoseismic record.

  6. Evidence of Fukushima fallout in the area affected by wildfires in Kamaishi (Iwate Prefecture, Tohoku Region, Japan): Implications for future environmental research using radionuclide tracers Peer-reviewed

    Olivier Evrard, Naoya Takahashi, Hotaka Sato, Ryoga Ohta, Anthony Foucher, Thomas Chalaux-Clergue, Pierre-Alexis Chaboche

    Journal of Environmental Radioactivity　292　107876-107876　2026/01

    Publisher: Elsevier BV

    DOI： 10.1016/j.jenvrad.2025.107876 　

    ISSN： 0265-931X

  7. Landscape Signature of Seismogenic Faults in the Off and Onshore Domains of the Noto Peninsula in Japan's Back‐Arc Peer-reviewed

    Luca C. Malatesta, Shigeru Sueoka, Nina‐Marie Weiß, Boris Gailleton, Sumiko Tsukamoto, Daisuke Ishimura, Naoya Takahashi, Takuya Nishimura, Kyoko Kataoka, Tetsuya Komatsu, Yoshiya Iwasa

    Geophysical Research Letters　2025/12/28

    DOI： 10.1029/2025gl116602 　

    ISSN： 0094-8276 1944-8007

    More details Close

    <jats:title>Abstract</jats:title> <jats:p>The eastern margin of the Sea of Japan is a zone of great seismic and tsunami hazard due to multiple offshore and nearshore reverse faults as shown by the 2024 7.5 Noto Peninsula Earthquake. Here we compare coseismic deformation of the 2024 Noto Peninsula Earthquake with 4,767 individual marine terraces attributed to 16 successive sea‐level stages over the last Myr. This reveals that the earthquake faults started slipping between 326 and 238 ka. The emerged landscape is still adjusting to it while nearshore underwater scarps mark the active faults. Applied to nearby Sado Island, these observations reveal the likely location of an active fault that drives its fast deformation. Active faults defining the edge of uplifting land are likely found in the near shore domain, drowned by the current sea‐level high stand.</jats:p>

  8. Landscape changes caused by the 2024 Noto Peninsula earthquake in Japan International-coauthorship Peer-reviewed

    Yo Fukushima, Daisuke Ishimura, Naoya Takahashi, Yoshiya Iwasa, Luca C. Malatesta, Takayuki Takahashi, Chi-Hsien Tang, Keisuke Yoshida, Shinji Toda

    Science Advances　2024/12/06

    DOI： 10.1126/sciadv.adp9193 　

  9. LATE QUATERNARY ACTIVITY OF THE HARAMACHI SEGMENT OF THE FUTABA FAULT IN NORTHEAST JAPAN THROUGH TOPOGRAPHIC ANAGLYPH IMAGES AND BOREHOLE CORE SEDIMENT ANALYSIS International-coauthorship Peer-reviewed

    Anggraini Rizkita Puji, Naoya Takahashi, Shinji Toda

    Rudarsko-geološko-naftni zbornik　38　(2)　157-174　2023/06

    Publisher: Faculty of Mining, Geology and Petroleum Engineering

    DOI： 10.17794/rgn.2023.2.12 　

    eISSN： 1849-0409

    More details Close

    The Haramachi Fault segment in the northeastern part of Honshu Island, Japan, has mainly sinistral fault movements with minor reverse component within the Futaba Fault Zone in the northeastern Japan arc. The 2011 Mw 9.0 earthquake occurred off the Pacific coast of Tohoku which caused large crustal deformations. Despite being the closest active fault to the epicenter, very limited investigation has been conducted on the Futaba Fault Zone. Previous studies used smaller scale topographic maps and fault activity was estimated only from trenching and borehole investigations in the central part of the Haramachi Fault segment. Thus, geometry, kinematic, and recent tectonic activity of the fault segment is not well identified, especially in northern part. In this study, we use a combination of high-resolution DEMs (2-m and 5-m mesh), several types of topographic anaglyph images (slope, negative and positive openness), and conducted field survey to confirm remote sensing interpretation. Subtle surface expression of deformation associated with active faulting, such as deformed terrace risers, deflected drainages, and small fault scarps can now be identified more clearly. Several new fault strands in the northern part of the segment were found supported by fault outcrops found in the field confirming the recent activity of the fault system. The new estimation of the total length of the Haramachi segment produced from the approach of this study yields 25 km, which is capable of producing Mw 6.5 – 7.0 or Mjma 7.2 earthquakes if ruptures were to occur altogether in the future. Moreover, a shallow borehole survey and radiocarbon dating from the soil organic material has revealed the minimal timing estimation of the most recent faulting in the Haramachi segment to be 3694 ± 24 BP. This research provides a revised understanding of active fault distribution and deformation associated with the Haramachi segment and validates the timing of the most recent faulting event more broadly.

  10. Paleoseismic events and shallow subsurface structure of the central part of the Futagawa fault, which generated the 2016 Mw 7.0 Kumamoto earthquake Peer-reviewed

    Daisuke Ishimura, Yoshiya Iwasa, Naoya Takahashi, Ryuji Tadokoro, Ryuhei Oda

    Geomorphology　414　108387-108387　2022/10

    Publisher: Elsevier BV

    DOI： 10.1016/j.geomorph.2022.108387 　

    ISSN： 0169-555X

  11. Mapping active faults and folds of the Nagamachi-Rifu line fault system based on high-resolution DEM and a borehole dataset Peer-reviewed

    Naoya Takahashi, Shini Toda

    Active fault research　56　1-12　2022

    DOI： 10.11462/afr.2022.56_1 　

  12. Repeated triggered ruptures on a distributed secondary fault system: an example from the 2016 Kumamoto earthquake, southwest Japan Peer-reviewed

    Daisuke Ishimura, Hiroyuki Tsutsumi, Shinji Toda, Yo Fukushima, Yasuhiro Kumahara, Naoya Takahashi, Toshihiko Ichihara, Keita Takada

    Earth, Planets and Space　73　(1)　2021/02

    DOI： 10.1186/s40623-021-01371-x 　

    eISSN： 1880-5981

  13. 2019年カリフォルニア州リッジクレスト地震の概要と最近の地震断層調査の動向 Peer-reviewed

    高橋 直也, 内田 嗣人, 池田 倫治, 遠田 晋次

    活断層研究　(53)　51-65　2020

    DOI： 10.11462/afr.2020.53_51 　

  14. 3D Surface Displacement and Surface Ruptures Associated with the 2014 Mw 6.2 Nagano Earthquake Using Differential Lidar Peer-reviewed

    Naoya Takahashi

    Bulletin of the Seismological Society of America　109　(2)　780-796　2019/04

    Publisher: Seismological Society of America (SSA)

    DOI： 10.1785/0120180020 　

    ISSN： 0037-1106 1943-3573

    eISSN： 1943-3573

  15. 熊本地震地表地震断層の阿蘇カルデラ内の完新世活動履歴―南阿蘇村黒川地区トレンチ調査― Peer-reviewed

    遠田 晋次, 鳥井 真之, 奥野 充, 今野 明咲香, 小野 大輝, 高橋 直也

    活断層研究　(51)　13-25　2019

    DOI： 10.11462/afr.2019.51_13 　

  16. 熊本県益城町寺中における2016年熊本地震断層のトレンチ調査 Peer-reviewed

    堤 浩之, 遠田 晋次, 後藤 秀昭, 熊原 康博, 石村 大輔, 高橋 直也, 谷口 薫, 小俣 雅志, 郡谷 順英, 五味 雅宏, 浅野 公之, 岩田 知孝

    活断層研究　(49)　31-39　2018

    DOI： 10.11462/afr.2018.49_31 　

  17. 2016年熊本地震時に出現した熊本県阿蘇市宮地周辺の地表地震断層とピット壁面での変位の上方減衰 Peer-reviewed

    石村 大輔, 遠田 晋次, 市原 季彦, 高橋 直也, 今野 明咲香, 佐藤 隼人

    活断層研究　(47)　9-16　2017

    DOI： 10.11462/afr.2017.47_9 　

  18. Vertical slip rate on a normal fault co-ruptured with the Futagawa fault at the 2016 Kumamoto earthquake : a fault outcrop at Shimojin, Mashiki Town in Kumamoto Prefecture Peer-reviewed

    (46)　27-32　2017

    Publisher:

    DOI： 10.11462/afr.2017.46_27 　

    ISSN： 0918-1024

Show all ︎Show first 5

Misc. 3

  1. Three-stage evolution of particle shape in headwater streams

    Naoya Ono Takahashi, Daisuke Ishimura, Keitaro Yamada, Ryoga J. Ohta, Yuki Arai, Yuki Yamane

    EGUsphere　2025/03/25

    DOI： 10.5194/egusphere-2025-1080 　

  2. Shape of natural and manually crushed particles collected from a headwater stream in Tsugaru, Japan.

    Naoya Takahashi, Daisuke Ishimura, Keitaro Yamada, Ryoga Ohta, Yuki Arai, Yuki Yamane

    figshare　2025/02

  3. 何が川の形を決めるのか ─穿入蛇行の発達に伴う岩盤河川形状の変化─

    高橋直也

    GIS NEXT　80　2022/07

Books and Other Publications 4

  1. 1:25,000 活断層図「川尻」

    廣内大助, 澤 祥, 高橋直也, 田力正好

    国土地理院　2024/10

  2. 1:25,000活断層図「松島」

    岡田真介, 石村大輔, 高橋直也, 堤 浩之

    国土地理院　2023/09

  3. 熊本地震の痕跡からの学び

    国立大学法人熊本大学

    熊日出版　2022/04/12

    ISBN: 4908313849

  4. 1:25,000活断層図「三条」

    澤 祥, 石山達也, 堤 浩之, 高橋直也

    国土地理院　2020/03

Presentations 22

  1. Sensitivity of channel steepness to rock uplift rates modulated by sediment flux and grain size: insights from the modified saltation-abrasion incision model

    Naoya Takahashi

    Japan Geomorphological Union 2025 Annual meeting　2025/11/01

  2. 紀伊山地における重力変形地形の分布とその規定要因

    御手洗 聡, 高橋 直也

    日本地球惑星科学連合2025年大会　2025/05

  3. 削剥速度の増加にともなう河川・斜面形態の変化

    佐藤 穂岳, 高橋 直也

    日本地球惑星科学連合2025年大会　2025/05

  4. 福島県浜通り地方における1960年代以降の汀線変化

    上岡 優太, 高橋 直也

    日本地球惑星科学連合2025年大会　2025/05

  5. 岩種が山地河川の縦断形に影響する理由

    高橋 直也

    日本地球惑星科学連合2025年大会　2025/05

  6. Three-stage evolution of particle shape in the headwaters

    2025/03

  7. ストリームパワーモデルに基づく活断層の活動度推定:坪沼断層の例

    山根悠輝, 高橋直也

    日本第四紀学会 2024 年大会　2024/08/30

  8. Origin and evolution of bedrock step-pool

    Yuki Arai, Naoya Takahashi

    JpGU2024　2024/05

  9. Sediment discharge and its determinants in the burnt area of wildfire: The case of Osaki peninsula, Iwate

    Hotaka Sato, Naoya Takahashi, Ryoga Ohta

    JpGU2024　2024/05

  10. Contrasting grain size evolution in headwaters controlled by rock strength and provenance

    Naoya Takahashi, Daisuke Ishimura, Ryoga Ohta, Yuki Arai, Yuki Yamane

    JpGU2024　2024/05

  11. 源流部における粒子形状変化の岩種依存性：岩盤強度と礫供給源の影響

    高橋 直也, 石村 大輔, 太田 凌嘉, 荒井悠希, 山根 悠輝

    日本地理学会2024年春季学術大会　2024/03/19

  12. Spatiotemporal heterogeneity of denudation rates in a catchment inferred from long-lived cosmogenic nuclides Invited

    Naoya Takahashi

    TRACING2024 Emerging strategies of sediment and contaminant tracing in catchments and river systems　2024/03/05

  13. Sensitivity of bedrock channel steepness to on-fault vertical slip rates

    Naoya Takahashi

    JpGU2023　2023/05

  14. Impacts of bedrock river meandering on channel gradient

    Takahashi Naoya

    JpGU 2022　2022/05/30

  15. 高密度ボーリングデータから推定される長町-利府線断層帯の活構造分布

    高橋直也, 遠田晋次

    日本活断層学会 2021 年度秋季学術大会　2021/10/22

  16. 隆起速度の増加に伴う流路幅・斜面勾配の変化とその時間スケール:流域 スケールの平衡状態についての考察

    高橋直也, Bruce Shyu, 松四雄騎, 太田凌嘉, 遠田晋次

    日本地球惑星科学連合2021年大会　2021/06/04

  17. Transient process of channel adjustment to tectonics: Field evidence from Iwaki, Fukushima, Japan

    Naoya Takahashi

    American Geophysical Union Fall Meeting　2019/12

  18. Evaluating Variability in Co-seismic Slip at a Point from Incomplete Paleoseismic Records: An Example from the Kamishiro Fault, Itoigawa-shizuoka Tectonic Line Active Fault System, Central Japan Invited

    Naoya TakahashiShinji Toda

    AOGS 16th Annual Meeting　2019/07

  19. Correlating long-term uplift pattern with single earthquake rupture of a sub-parallel fault system based on stream profile analysis: An example from the 2016 Kumamoto earthquake rupture zone

    Naoya Takahashi

    American Geophysical Union Fall Meeting　2018/12

  20. Defining subsegments and testing their roles by comparing with actual rupture extent: an example from the Kamishiro fault, Japan

    Naoya Takahashi

    9th International INQUA Meeting on Paleoseismology, Active Tectonics and Archeoseismology　2018/06

  21. 河床材料の多寡は岩盤強度と河床勾配の関係を変えるか

    高橋直也, 荒井悠希

    日本地理学会2023年春季学術大会　2023/03

  22. テクトニックバルジの内部構造と発達過程 ‐熊本県南阿蘇村立野地区における UAV 調査‐

    高橋直也, 村上智昭, 遠田晋次, 坂東雄一, 加茂圭祐, 松山和馬, 中原毅, 高見智之

    日本活断層学会2017年度秋季学術大会　2017/11

Show all Show first 5

Research Projects 3

  1. 砕屑物の形状は何を語るか？-段丘・イベント堆積物の給源・運搬過程解明への応用研究-

    石村 大輔

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 基盤研究(B)

    Institution: 東京都立大学

    2024/04/01 - 2028/03/31

  2. 隆起速度か粒径か：急流河川形成要因の解明

    高橋 直也

    Offer Organization: 日本学術振興会

    System: 科学研究費助成事業

    Category: 若手研究

    Institution: 東北大学

    2024/04/01 - 2028/03/31

  3. Does sediment dynamics alter the dependency of bedrock river morphology on rock strength?

    Offer Organization: Japan geographic data center

    2022/10 - 2023/10

Teaching Experience 5

  1. セミナー基礎　東北大学

  2. 自然科学総合実験　東北大学

  3. 野外実習Ⅲ　東北大学

  4. 地学実験　東北大学

  5. 地理情報解析学実習　東北大学